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Depth-of-Field Scale
The depth·of·field scale indicates the range of
subjects which will be in focus sharply on the
film.
This range will vary with the following
factors
:
The depth·of·field will be deeper the
smaller the aperture opening, the further the
distance of the subject, and/or the shorter the
lens focal length.
The depth·of·field will be
shallower the larger the aperture opening, the
nearer the distance of the subject,
and/
or the
longer the lens focal length
.
34
t
/
8
50mm
Depth·ot·field
2.3m-4.3
m 18'-14'
)
Foc
used at
3
m
1 10')
o
For example, if the lens used is 50mm and
the subject has been focused at a distance of
3m (10'). with an
f/
8 aperture value read off
from both indexes on either side of the indicator
(orange line). the depth ·of ·field is from approxi
·
mately 2 .3m
(8'
) to 4.3m (14').
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